package com.example.teacher.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.example.servicebase.exceptionhandler.CustomException;
import com.example.servicebase.exceptionhandler.GlobalExceptionHandler;
import com.example.teacher.entity.EduSubject;
import com.example.teacher.entity.excel.SubjectData;
import com.example.teacher.service.EduSubjectService;

public class SubjectListener extends AnalysisEventListener<SubjectData> {
    //因为这个类没有交给spring管理，所以不能注入对象，使用有参构造函数
    //接收已经注入的对象，
    private EduSubjectService subjectService;

    public SubjectListener() {}

    public SubjectListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if (subjectData==null){
            throw new CustomException(20001,"文件数据为空");
        }
        //一行一行读取文件，第一列为一级分类，第二列为二级分类
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if (existOneSubject==null){//没有相同的一级分类
            existOneSubject=new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneSubject);
        }
        //获取一级分类的id值
        String pid = existOneSubject.getId();
        //添加二级分类
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(),pid);
        if (existTwoSubject==null){//没有相同的一级分类
            existTwoSubject=new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());
            subjectService.save(existTwoSubject);
        }

    }

    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService,String name){
        QueryWrapper<EduSubject> wrapper =new QueryWrapper<>();
        wrapper.eq("title",name); //title列等于 name
        wrapper.eq("parent_id","0"); //且没有父分类
        EduSubject oneSubject =subjectService.getOne(wrapper);
        return oneSubject;
    }
    //二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper=new QueryWrapper<>();
        wrapper.eq("title",name);//title列等于name
        wrapper.eq("parent_id",pid);//且父分类等于pi的二级分类
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
